MOBILE WORK MACHINE, ESPECIALLY FORESTRY MACHINE

Description

[0001] The invention relates to a mobile work machine, in particular a forestry machine, which is provided with a chassis, a drive unit, a cable winch, a stanchion and an adjustable ramp plate arranged at the rear of a vehicle body, wherein the work machine does not have a driver's workplace for an operator and is designed as a remote-controlled work machine.

[0002] A generic remote-controlled work machine is known from DE 10 2018 104 810 A1.

[0003] A device for logging with a ramp shield is known from US 2 156 183 A.

[0004] Such mobile forestry machines are used as tree felling aids and as forwarding aids for delivering felled trees to a forest road. Since the machine does not have a driver's cab, this type of machine can be built compactly and lightweight, allowing it to be used in forest areas unsuitable for conventional large machines.

[0005] On typical mobile work machines, the ramp shield serves exclusively to pull a tree trunk onto the stanchion using the cable winch. A tree trunk placed on the stanchion provides high traction due to the weight of the log acting on the work machine, despite the machine's low dead weight.

[0006] The object of the present invention is to provide a work machine of the type mentioned at the beginning, which can be used for more universal applications.

[0007] This object is achieved according to the invention in that the ramp sign is provided with at least one fastening interface to which an additional stanchion can be detachably fastened, and / or the ramp sign is provided with a fastening interface to which a trailer coupling head can be detachably fastened.

[0008] With such fastening interfaces, it is possible to temporarily create a second row of additional stakes on the ramp sign, formed by two additional stakes. This makes it possible to transport wooden poles, for example fence posts and / or fencing material, such as chain link mesh, between the stake and the additional stakes, which is required, for example, to fence in reforestation areas. Furthermore, it is possible to transport a water tank between the stake and the additional stake in order to water reforestation areas and newly planted trees. With the temporarily formable additional stake, the ramp sign can therefore be used as a transport platform. With such fastening interfaces, it is alternatively or additionally possible to temporarily attach a trailer coupling head to the ramp sign, which can be used to tow a trailer. With the fastening interfaces on the ramp sign and the additional stakes or stakes that can be attached to them.With the trailer coupling head, the working machine can be used for a wide variety of transport tasks in addition to its function as a felling aid and as a forwarding aid, and can therefore be used for more universal applications.

[0009] According to an advantageous embodiment of the invention, the fastening interface is formed by a receiving sleeve arranged in the ramp plate, into which the additional stanchion and / or the trailer coupling head can be inserted and which is arranged countersunk in the ramp plate. An additional stanchion or a trailer coupling head can be quickly and easily inserted and removed from such receiving sleeves, thus enabling rapid conversion of the work machine for transport tasks. A countersunk arrangement of the receiving sleeves in the ramp plate ensures that the receiving sleeves do not protrude upwards from the ramp plate, thus preventing any disruptive edges from being created by the receiving sleeves that could hinder the pulling of a tree trunk onto the stanchion.

[0010] Advantages arise if, according to a further development of the invention, the additional stanchion and / or the trailer coupling head is provided with a stop flange, with which the additional stanchion and / or the trailer coupling head rests against the upper side of the receiving sleeve when inserted. Such a stop flange can easily form a stop that facilitates the insertion of the additional stanchion and / or the trailer coupling head into the corresponding receiving sleeve.

[0011] According to a further development of the invention, the additional stanchion and / or the trailer coupling head can be secured in the receiving sleeve with a securing element, in particular a cotter pin or a lock nut. The cotter pin can be designed, for example, as a spring pin or a linch pin. With a securing element designed as a cotter pin or lock nut, the additional stanchion and / or the trailer coupling head inserted into the receiving sleeve can be quickly and easily secured against falling out of the receiving sleeve.

[0012] According to a particularly advantageous embodiment of the invention, two fastening interfaces arranged at a distance from one another in the transverse direction of the vehicle are provided, to each of which an additional stanchion can be releasably fastened. Thus, a row of additional stanchions consisting of two additional stanchions arranged laterally and spaced apart in the transverse direction of the vehicle can be temporarily formed on the ramp shield in a simple manner.

[0013] According to a particularly advantageous embodiment of the invention, a fastening interface is provided, arranged substantially centrally in the transverse direction of the vehicle, to which the trailer coupling head can be releasably fastened. This fastening interface makes it easy to temporarily arrange a trailer coupling head centrally on the ramp shield in the transverse direction of the vehicle.

[0014] Particular advantages arise if, according to an advantageous development of the invention, the ramp shield can be supported in a substantially horizontal position on the vehicle body of the work machine by means of at least one support strut. With such a support strut, the ramp shield can be locked and secured in a substantially horizontal position for transport tasks in a simpler and faster manner.

[0015] The support strut can be designed as a fixed strut. Advantages arise when the support strut is designed as a threaded strut, particularly a double-threaded rod. A threaded strut makes it easy to adjust the length of the support strut to support the ramp shield for transport tasks in a selected position of the adjustable ramp shield. The threaded strut is preferably designed as a double-threaded rod, for example, as a so-called top link, which is familiar from 3-point hydraulic systems on tractors.

[0016] According to an advantageous embodiment of the invention, the support strut can be detachably attached to the vehicle body by means of a bolt connection and to the ramp shield by means of a bolt connection. This allows the support strut to be attached to the vehicle body and the ramp shield quickly and easily, if necessary.

[0017] The adjustable ramp shield is preferably arranged at the rear of the work machine so that it can be adjusted around a horizontal transverse axis of the vehicle.

[0018] Advantages arise when the adjustable ramp shield can be adjusted around the vehicle's transverse axis using at least one hydraulic cylinder. This allows the ramp shield to be easily tilted around the horizontal transverse axis of the vehicle as needed, allowing it to be adjusted to a substantially horizontal position for transport tasks or lowered to the ground for forwarding tasks.

[0019] Preferably, the hydraulic cylinder is actuated by means of a control valve having a floating position. In the floating position, the ramp blade, lowered to the ground, can follow the contours of the ground and slide over the ground, thereby making it possible to clear forest paths with the ramp blade lowered to the ground.

[0020] Particular advantages arise when the stanchion has two vertical stanchion rods spaced apart in the transverse direction of the vehicle and mounted so that they can rotate about a vertical axis. A tree trunk can easily be placed between two such stanchion rods when the machine is used as a forwarding aid.

[0021] According to a further development of the invention, a transverse reinforcement is arranged on the vehicle body in the longitudinal direction of the vehicle between the stanchion and the ramp shield. The transverse reinforcement enables a torsionally rigid and stable design of the work machine at the rear of the vehicle, on which the adjustable ramp shield is mounted. Logs are pulled onto the stanchion by means of the cable winch or on which corresponding loads are transported for transport purposes.

[0022] Further advantages and details of the invention will be explained in more detail with reference to the embodiment shown in the schematic figures. Figure 1 shows a perspective view of a mobile work machine according to the invention, Figure 2 shows the work machine in a perspective view from below, Figure 3 shows a section along the line AA of the Figure 1 , Figure 4 a section of the Figure 2 in an enlarged view, Figure 5 a section along the line BB of the Figure 1 in a perspective view and Figure 6 a section along the line BB of the Figure 1 in a side view.

[0023] In the Figures 1 and 2 a remote-controlled mobile work machine 1 according to the invention, for example a forestry machine, is shown in a perspective view.

[0024] The mobile work machine 1 comprises a chassis 2 formed by two crawler tracks 2a, 2b, each driven, for example, by a hydraulic drive motor 3a, 3b. The drive motors 3a, 3b are each arranged at the rear end, i.e., at the rear end, of the crawler tracks 2a, 2b, as viewed in the vehicle's longitudinal direction L.

[0025] The mobile work machine 1 has a drive unit 3, a cable winch 4, a stanchion 5, and an adjustable ramp shield 6, which is arranged at the rear of a vehicle body 8 and is adjustable about a horizontal transverse vehicle axis 7. The work machine 1 does not have a driver's workplace for an operator and can be operated by an operator using a remote control (not shown in detail). The drive unit 3 can have an internal combustion engine that drives one or more hydraulic pumps that supply the travel drive motors 3a, 3b, a hydraulic motor driving the cable winch 4, and other hydraulic consumers of the work machine, for example, hydraulic cylinders for adjusting the ramp shield 6.

[0026] In the work machine 1 according to the invention, the drive unit 3 is arranged at the front of the vehicle, viewed in the vehicle's longitudinal direction L, the cable winch 4 is arranged adjacent to the drive motor 3, the stanchion 5 is arranged adjacent to the cable winch 4, and the adjustable ramp plate 7 is arranged at the rear of the vehicle. The cable winch 4 is thus arranged between the stanchion 5 and the drive motor 3, viewed in the vehicle's longitudinal direction.

[0027] The stanchion 5 is arranged vertically above a floor plate 10 of the vehicle body 8.

[0028] The drive unit 3 and the cable winch 4 are arranged in a front half of the working machine 1. The base plate 10 with the stanchion 5 located thereon forms a rear half of the working machine 1.

[0029] The stanchion 5 is preferably mounted for rotation about a vertical axis V. The rotatable stanchion 5 can advantageously be locked in one or more positions by means of a locking device. In the illustrated embodiment, the stanchion 5 has two vertical stanchion rods 5a, 5b arranged at a distance from one another in the vehicle transverse direction Q, which are fastened to a cross member 5c mounted on the base plate 10 for rotation about the vertical axis V.

[0030] In the vehicle longitudinal direction L between the stanchion 5 and the ramp plate 6 arranged at the rear of the vehicle, a transverse stiffener 15 is also arranged on the upper side of the floor plate 10.

[0031] According to the invention, the ramp sign 6 is provided with at least one fastening interface 20a, 20b, 21. At the fastening interface 20a, 20b, a Figures 1 to 3 The additional stanchions 25a, 25b shown in the drawing can be releasably attached. Figures 1 , 5 and 6 The trailer coupling head 26 shown can be releasably attached.

[0032] The fastening interface 20a, 20b, 21 is - as can be seen from the Figures 3 , 5 and 6 as can be seen, is formed by a receiving sleeve 30 arranged in the ramp plate 6, into which the additional stanchion 25a, 25b or the trailer coupling head 26 can be inserted from above. The ramp plate 6 consists of an upper cover plate 6a and stiffening supports 6b arranged below the cover plate 6a. The receiving sleeves 30 are countersunk in the cover plate 6a of the ramp plate 6 and are thus arranged below the cover plate 6a.

[0033] The additional stanchions 25a, 25b and the trailer coupling head 26 are each provided with a stop flange 35a, 35b, 35c, with which the additional stanchions 25a, 25b and the trailer coupling head 26 rest against the upper side of the receiving sleeve 30 when inserted.

[0034] In order to secure the additional stanchions 25a, 25b and the trailer coupling head 26 in the receiving sleeve 30 in the inserted state, the additional stanchions 25a, 25b and the trailer coupling head 26 can each be secured with a securing element 40 in the receiving sleeve 30. The securing element 40 is preferably designed as a securing split pin, for example a spring pin or linch pin, or as a screwed-on locking nut.

[0035] In the illustrated embodiment, two fastening interfaces 20a, 20b are provided, spaced apart from one another in the vehicle transverse direction Q, to each of which an additional stanchion 25a, 25b designed as a stanchion bar can be releasably fastened. The fastening interfaces 20a, 20b for the additional stanchions 25a, 25b are preferably arranged in the rear half of the ramp shield 6 and on the outer sides of the ramp shield 6.

[0036] For the trailer coupling head 26, a fastening interface 21 is provided, arranged essentially centrally in the vehicle transverse direction Q, to which the trailer coupling head 26 can be releasably fastened. The fastening interface 21 for the trailer coupling head 26 is arranged at the rear end of the ramp plate 6.

[0037] At least one hydraulic cylinder 50 is provided for adjusting the ramp shield 6 about the vehicle's transverse axis 7. In the illustrated embodiment, two hydraulic cylinders 50 are provided, which are installed below the base plate 10 and engage the stiffening supports 6b of the ramp shield 6 at a distance from the axis 7.

[0038] When the ramp shield 6 is lowered to the ground with its rear end, the ramp shield 6 serves to improve the support of the work machine 1 when a tree trunk is pulled towards the work machine 1 using the cable winch 4. Ground hooks (not shown in detail) can be arranged at the rear end of the ramp shield 6 for improved support in the ground. These hooks can be designed as hooks, angles, brackets, or clamp-like staples.

[0039] The hydraulic cylinders 50 can be actuated by means of a control valve which has a lifting position for raising the ramp shield 6, a lowering position for lowering the ramp shield 6 and a floating position in which a ramp shield 6 lowered to the ground can follow the ground contour.

[0040] The control valve controlling the hydraulic cylinders 50 may further have a locking position to enable the load of the ramp shield 6 to be held in a selected position.

[0041] In the work machine 1 according to the invention, a parallel drive of the travel drive motors 2a, 2b and the hydraulic cylinders 50 actuating the ramp shield 6 is preferably enabled, whereby an effective tumbling of tree trunks and pushing of tree trunks as well as a positioning of the ramp shield 6 during the travel of the work machine 1 is enabled.

[0042] In order to lock the ramp plate 6 in a substantially horizontal position for transport tasks, in which the ramp plate 6 is arranged as an extension of the base plate 10, at least one support strut 65 is provided. In the illustrated embodiment, a support strut 65 is provided which is arranged substantially centrally in the vehicle transverse direction Q. In the horizontal position of the ramp plate 6, the support strut 65 is located below the cover plate 6a of the ramp plate 6. The support strut 65 thus supports the ramp plate 6 independently of the hydraulic cylinders 50, so that the hydraulic cylinders 50 are relieved of the forces acting on the ramp plate 6 during transport tasks and the ramp plate is held in a desired position regardless of leaks at the hydraulic cylinder 50.

[0043] The support strut 65 is preferably designed as a threaded strut, for example as a double threaded rod (top link).

[0044] The support strut 65 can be releasably fastened by means of bolt connections (not shown in detail) to a bearing flange 66 arranged at the rear of the vehicle body 8 and to a bearing flange 67 of the ramp shield 6. The bearing flange 67 is preferably formed by bearing bores 68 for a bolt in a stiffening beam 6b of the ramp shield 6 arranged centrally in the vehicle transverse direction Q.

[0045] The additional stanchions 25a, 25b inserted into the fastening interfaces 20a, 20b thus form an additional row of stanchions on the ramp plate 6 in addition to the stanchion 5 on the base plate 10. The trailer coupling head 26 inserted into the fastening interface 21 forms a trailer coupling with which trailers can be towed in the forward direction of travel of the work machine 1.

[0046] The work machine 1 preferably has a maximum width of 1.5 m, so that the work machine 1 can be transported to the work sites on a car trailer.

[0047] The ramp plate 6, supported in the horizontal position by means of the support strut 65, thus forms a transport platform with a base area of, for example, 2m 2<, which extends the base plate 10 and which makes it possible to transport a wide variety of goods, for example fences, water containers, building materials or agricultural goods, and to tow trailers.

[0048] The shape of the ramp shield 6, in particular the shape of the cover plate 6a of the ramp shield 6, can be selected depending on the main application of the work machine 1. In addition to a flat shape of the cover plate 6a, the cover plate 6a can be designed to be hollowed downwards in the vehicle's longitudinal direction L to enable improved reception and transport of a tree trunk, or alternatively, it can be designed to be hollowed upwards in the vehicle's longitudinal direction L to enable improved rope access of a tree trunk from a slightly inclined direction.

Claims

1. Mobile working machine (1), in particular forestry machine, which is provided with a running-gear unit (2), a drive unit (3), a winch (4), a stanchion (5) and with an adjustable ramp plate (6) which is arranged at the rear of a vehicle body (1), wherein the working machine (1) does not have a driver's workstation for an operator and is designed as a remote-controlled working machine (8), characterized in that the ramp plate (6) is provided with at least one fastening interface (20a, 20b) to which an additional stanchion (25a; 25b) is releasably fastenable, and / or the ramp plate (6) is provided with a fastening interface (21) to which a trailer-hitch head (26) is releasably fastenable.

2. Mobile working machine according to Claim 1, characterized in that the fastening interface (20a; 20b; 21) is formed in each case by a receiving sleeve (30) arranged in the ramp plate (6), into which the additional stanchion (25a; 25b) and / or the trailer-hitch head (26) are / is pluggable and which is arranged in a recessed manner in the ramp plate (6).

3. Mobile working machine according to Claim 2, characterized in that the additional stanchion (25a; 25b) and / or the trailer-hitch head (26) are / is provided with a stop flange (35a; 35b; 35c), by way of which, in the plugged-in state, the additional stanchion (25a; 25b) and / or the trailer-hitch head (26) abut(s) against the top side of the receiving sleeve (30).

4. Mobile working machine according to Claim 2 or 3, characterized in that the additional stanchion (25a; 25b) and / or the trailer-hitch head (26) are / is able to be secured in the receiving sleeve (30) by way of a securing element (40), in particular a securing splint or a securing nut.

5. Mobile working machine according to one of Claims 1 to 4, characterized in that provision is made of two fastening interfaces (20a; 20b) which are arranged so as to be spaced apart from one another in the vehicle transverse direction (Q) and to which in each case one additional stanchion (25a; 25b) is releasably fastenable.

6. Mobile working machine according to one of Claims 1 to 5, characterized in that provision is made of a fastening interface (21) which is arranged substantially centrally in the vehicle transverse direction (Q) and to which the trailer-hitch head (26) is releasably fastenable.

7. Mobile working machine according to one of Claims 1 to 6, characterized in that the ramp plate (6) is supportable in a substantially horizontal position against the vehicle body (8) of the working machine (1) by means of at least one supporting strut (65).

8. Mobile working machine according to Claim 7, characterized in that the supporting strut (65) is in the form of a threaded strut, in particular a double-threaded rod.

9. Mobile working machine according to Claim 7 or 8, characterized in that the supporting strut (65) is releasably fastenable to the vehicle body (8) by means of a bolt connection and to the ramp plate (6) by means of a bolt connection.

10. Mobile working machine according to one of Claims 1 to 9, characterized in that the adjustable ramp plate (6) is arranged at the rear of the working machine (1) so as to be adjustable about a horizontal vehicle transverse axis (7).

11. Mobile working machine according to one of Claims 1 to 10, characterized in that the adjustable ramp plate (6) is adjustable about the vehicle transverse axis (7) by means of at least one hydraulic cylinder (50).

12. Mobile working machine according to Claim 11, characterized in that the hydraulic cylinder (50) is actuatable by means of a control valve that has a floating position.

13. Mobile working machine according to one of Claims 1 to 12, characterized in that the stanchion (5) has two vertical stanchion rods (5a, 5b) arranged so as to be spaced apart in the vehicle transverse direction (Q) and is mounted so as to be rotatable about a vertical axis (V).

14. Mobile working machine according to one of Claims 1 to 13, characterized in that a transverse reinforcement (15) is arranged on the vehicle body (8) between the stanchion (5) and the ramp plate (6) in the vehicle longitudinal direction (L).